问题描述

每个人都使用很多列表.我需要遍历这个列表，所以我使用已知的 SyncRoot 模式.

Everyone use lot of List. I need to iterate over this list, so I use the known SyncRoot pattern.

最近我在 这篇 帖子中注意到 SyncRoot 应该是避免支持嵌入式"线程安全(每个方法都将锁定一个私有对象，而不使用 SyncRoot 属性公开它).我可以理解，并且部分同意.

Recently I noticed in this post that the SyncRoot should be avoided in favor of "embedded" thread-safety (each method will lock on an private object without exposing it using SyncRoot property). I can understand it, and partially I agree on that.

问题是 List<T> 类没有t 实现 SyncRoot 属性，即使实现 ICollection 接口，它公开了 SyncRoot 属性.我说这是因为代码

The question is that List<T> class doesn't implements the SyncRoot property, even if implements the ICollection interface, which expose the SyncRoot property. I say this bause the code

 List<int> list = new List<int>()
 list.SyncRoot;

给我以下编译器错误:

错误 CS0117:System.Collections.Generic.List"不包含SyncRoot"的定义

error CS0117: 'System.Collections.Generic.List' does not contain a definition for 'SyncRoot'

...如果这是真的，我如何同步 List<T> 类型的公共属性?什么时候迭代它?

...If this is true, how could I synchronize a public property of type List<T> when iterating over it?

推荐答案

其实是显式实现的.

object ICollection.SyncRoot
{
    get
    {
        if (this._syncRoot == null)
        {
            Interlocked.CompareExchange(ref this._syncRoot, new object(), null);
        }
        return this._syncRoot;
    }
}

这意味着您必须强制转换为 ICollection 才能使用它.

This means you must cast to ICollection to use it.

这篇关于列出&lt;T&gt;没有实现 SyncRoot！的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！